package com.sari.common.utils;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by 王世锋 on 2016/5/24.
 */
public class ImageRequest {
    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {

    }

    public static String saveImg(String imgUrl){
        String imgName = "";
        try{
            //new一个URL对象
            URL url = new URL(imgUrl);
            //打开链接
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            //设置请求方式为"GET"
            conn.setRequestMethod("GET");
            //超时响应时间为5秒
            conn.setConnectTimeout(5 * 10000);
            //通过输入流获取图片数据
            InputStream inStream = conn.getInputStream();
            //得到图片的二进制数据，以二进制封装得到数据，具有通用性
            byte[] data = readInputStream(inStream);
            //new一个文件对象用来保存图片，默认保存当前工程根目录
            imgName = DateUtils.getTimeMillis()+".png";
            File imageFile = new File("D://workspace/spot/shop/"+imgName);
            //创建输出流
            FileOutputStream outStream = new FileOutputStream(imageFile);
            //写入数据
            outStream.write(data);
            //关闭输出流
            outStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
        return imgName;
    }

    public static byte[] readInputStream(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[1024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len = 0;
        //使用一个输入流从buffer里把数据读取出来
        while( (len=inStream.read(buffer)) != -1 ){
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        //关闭输入流
        inStream.close();
        //把outStream里的数据写入内存
        return outStream.toByteArray();
    }
}
